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EXAMPLE
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Non-isomorphic representatives of the a(1) = 1 through a(10) = 5 set systems:
1: {{1}}
3: {{2},{1,2}}
6: {{3},{2,3},{1,2,3}}
{{1,2},{1,3},{2,3}}
7: {{1,3},{2,3},{1,2,3}}
8: {{2,4},{3,4},{1,2,3,4}}
{{3},{1,3},{2,3},{1,2,3}}
9: {{1,2,4},{1,3,4},{2,3,4}}
{{4},{2,4},{3,4},{1,2,3,4}}
{{1,2},{1,3},{1,4},{2,3,4}}
{{1,2},{1,3},{2,3},{1,2,3}}
10: {{4},{3,4},{2,3,4},{1,2,3,4}}
{{4},{1,2,4},{1,3,4},{2,3,4}}
{{1,2},{2,4},{1,3,4},{2,3,4}}
{{1,4},{2,4},{3,4},{1,2,3,4}}
{{2,3},{2,4},{3,4},{1,2,3,4}}
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